I wanted to try LM3652 to charge a 6v SLA Battery. I calculated the values for resistors and inductor connected to the IC. I checked many times every thing but it's not charging the battery and instead it's drawing current from the battery. also the LED's that I have connected to pins CHRG and FAULT are ON. I'll try to post the schematic but for now, does any body have any experience or any idea why it's happening?

 

One thing that is universal is the easy mistake of getting the pinout wrong. Everyone does it from time to time. So a picture may also be helpful, in addition to the schematic. A second set of eyes is always helpful.

 

have you built the circuit on the datasheet?

 

What is the voltage input to your circuit? What is the output voltage of your circuit? Are you using a diode to prevent battery discharge through your 'charging' circuit?

More info including schematic & pictures needed to enable us to provide you with any significant help beyond just guessing. You must decide if you want guessing help or real help.

 

Thanks guys.
This is the schematic:

The battery is SLA 6v and I ve used the schematic in the first page of datasheet and calculated the value of resistors, now the threshold voltage of battery is more than 6v, 6.4 or 6.3 I guess and the current voltage of batter is 5.99 so it is supposed to be charged to 6.4v and then Vfb becomes 3.3v and the charging will be stopped. The calculated value of inductor for I guess 1mA fluctuation was 0.5 but because of unavailability I used 1uH and also the calculated value for Rsense was 0.5 ohm but I used the smaller one that I had.
You can see the currents in the circuit in the schematic.

This are the pictures of implementation on the breadboard:

Any idea?

 

With a solar panel producing 25mA, you can just connect direct to the 6v SLA battery.

Lead acid batteries won't overcharge when trickled with such a low current for 5 to 6 hours a day!

 

Actually 25mA current was just in a cloudy day other wise it goes to 100-200mA. I need to know what's wrong in this circuit or with IC?

 

One question, where is exactly pin 13 (SGND) which is mentioned in the page 8 of datasheet as following, Is that in the backside (bottom) of the IC that. I 've ignored it?
SGND (Pin 13): Ground Reference and Backside ExposedLead Frame Thermal Connection. Solder the exposed lead frame to the PCB ground plane.